Installing a Shimano 105 RD-R7150 rear derailleur onto a 2019 Checkpoint SL5 and I'm having trouble determining whether or not I need the mounting piece circled. Googling only made me more confused.
Shimano Drivetrain Comparison - XTR vs XT vs SLX vs Deore [Video] | Worldwide Cyclery
Shimano 105 Rd-r7100 Rear Derailleur - 12-speed, Direct Mount, One Spec, Shadow Design, 36t Max Low : Target
Shimano Deore 10-speed Chain - Bicycle Way of Life | Eugene, OR